Large Batch Of Buttercream

I make french buttercream and am wondering how it would do if I quadrupled the recipe. OUr chef and pastry chef have been converting all of the recipes and to tell you the truth- no one like his buttercream. He has such a huge ego we don't dare ask him. Any suggestions? Any help is appreciated. Should I post the recipe?

I've not heard of French buttercream. I make Italian Meringue Buttercream and have doubled the recipe with no problems (my mixer won't hold more than a double batch, but if I had an industrial mixer I'm sure it could be quadrupled or more without problems). Could you post your recipe?

add sugar and egg whites into a heat safe bowl. over a double boiler, whisk this mixture until the sugar is dissolved, the misture will have a white fluffy apperance and be hot to touch. Place mixture in a mixer on high until stiff peak stage. Slowly add butter until combined. add flavor.